Wood

Uranium

I guess using renewables for the energy needs of metal production would work too

Steel or stainless ain't gonna give you metal poisoning

i literally cannot help myself.

do micro metals even exist in substantial capacity? The problem with micro plastics is that they don't break down and decay until like a gazillion years later, so whatever micro plastics are in your kidneys now, will continue to be in them until you die.

honestly, this might be true. There are definitely worse things to be made from metal lol